The Design of Constant Pressure Water Supply Control System Based on S7-200 PLC

Abstract

IN tall buiding’s constant pressure water supply system with PLC and frequency converter logic control, PLC is used for logic control and frequency converter for pressure regulation . PLC and frequency converter which are the core components of the system track changes on the deviation of the pressure in a pipe with the given pressure,through the PLC internal PID operational, it can control variable frequency and power frequency switching and automatic control the number of inputting pumps and speed of the motor to realize closed loop automatic regulation voltage variable water supply, It can achieve the purpose of controlling the flow of water while maintaining constant pressure.